Finding the Fourth Proportional to 1,111,098.67, 1,666,650.14 and 428,307.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111,098.67 : 1,666,650.14 = 428,307.05 : x
2. Step 2: Convert to fraction form
   1,111,098.67/1,666,650.14 = 428,307.05/x
3. Step 3: Cross multiply
   1,111,098.67x = 1,666,650.14 × 428,307.05
4. Step 4: Simplify right side
   1,111,098.67x = 713,838,010,082.88
5. Step 5: Solve for x
   x = 713,838,010,082.88/1,111,098.67
6. Step 6: Final answer
   x = 642,461.40